93489821 has 2 divisors, whose sum is σ = 93489822. Its totient is φ = 93489820.

The previous prime is 93489811. The next prime is 93489841. The reversal of 93489821 is 12898439.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78943225 + 14546596 = 8885^2 + 3814^2 .

It is an emirp because it is prime and its reverse (12898439) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 93489821 - 2¹⁴ = 93473437 is a prime.

It is a super-2 number, since 2×93489821² = 17480693261224082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (93489811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46744910 + 46744911.

It is an arithmetic number, because the mean of its divisors is an integer number (46744911).

Almost surely, 2^93489821 is an apocalyptic number.

It is an amenable number.

93489821 is a deficient number, since it is larger than the sum of its proper divisors (1).

93489821 is an equidigital number, since it uses as much as digits as its factorization.

93489821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 44.

The square root of 93489821 is about 9669.0134450212. The cubic root of 93489821 is about 453.8595129628.

The spelling of 93489821 in words is "ninety-three million, four hundred eighty-nine thousand, eight hundred twenty-one".